Method of making ring-dies



(No Model.)

P EGAUBERT METHOD OF MAKING RING DIES.

1 I0.-404,\"' 2Z.v Patented June 4, 1889.

UNITED STATES v PATENT 'QFF'ICE;

FREDERIC EOAIIBERT, OF BROOKLYN, NEIV ,YORK.

METHOD OF MAKING RING-DIES.

SPECIFICATION forming part of Letters Patent No. 404,522, dated une 4,1889. Application filed November 5, 1888. Serial No. 289,972: (Nomodel.)

To all whom, it may concern:

Be it known that I, FREDERIO EOAUBERT, of Brooklyn, in the county ofKings and State of New York, have invented an Improvement in the Methodof Making Ring-Dies, of which the following is a specification.

Dies for making the exterior surface of watch-case centers and similararticles have been made in the form of a ring, with the rcverseengraving upon the interior surface of such ring; but where the metal isforced into recesses in the pattern engraved upon the interior of thesteel ring the said steel ring-die cannot be removed from the finishedarticle unless the same is made in sections.

In dies for making watch-case centers I have heretofore constructed aring-die in two, three, or more pieces; and in order to'finish up theends of the segmental arcs composing the rings it has been necessary tofile and fit the steel while in a soft condition, and it is practicallyimpossible to bring the ends of the steel sections together withsufficient accuracy to prevent a fin or imperfection appearing upon thesurface of the article that is struck up or rolled into the circulardie; and in addition to this I have found that when the sections are puttogether for composing the steel ring and the interior surfaces of suchsections are engraved while the steel is soft the operation of hardeningthe steel renders the sections of the ring untrue, so that they aregenerally on their faces arcs of circles described with a longer radiusthan they were when in the soft and untempered condition.

My improved method of manufacturing ring-dies is an improvement upon theforegoing methods, for the purposes of obviating the difficulty arisingin the tempering of the steel segments and for rendering the jointbetween one section and the next invisible both in the die and in theproduct made in the die. \Vith this object in View I turn up orotherwise form a ring of steel of the proper size and shape, with theinterior surface or edge corresponding to the contour of the article tobe manufactured, and when the surface of that article is to beornamented the surface of the die is recessed to correspond to therelief ornaments of the finished article; and my present improvement isadapted to any ring-die having an interior finished surface for theproduction of watch-case centers or other articles by pressure from aroller, as in my Pat ent No. 253,355, or otherwise.

After the die has been completed so far as the size, ornamentation, &c.,is concerned, the die is hardened in any usual manner, and in so doingthe ring shape of the die is not disturbed perceptibly. I then break thering up into two, three, or more pieces, care being taken to obtainfractures as nearly in the radial lines as convenient, and I find inpractice that the ringdie can be broken into two, three, or more pieces,when of the proper temper for use, without the die being bent ordisturbed in its shape by the breaking operation. The consequence isthat the rough surfaces of the fractures match exactly when the parts ofthe ring are properly set together, and it is impossible to set theparts of the ring closely together when either section is misplaced,because no one fracture will correspond to another fracture, and whenthe sections of the ring are set together the fractures aresubstantially invisible, and when the ring-shaped die is inserted intothe proper holder-such, for instance, as that shown in my aforesaidpatent-the Watch-case center or ot-herring can be spun, rolled, orotherwise pressed to shape within the ring-shaped die, soas to receivethe pattern engraved upon the inner surface of such die, and the linesof fracture will not be apparent upon the surface of the watch-casecenter or other article,

thereby obtaining a better finish upon the article made in such circulardie than has heretofore been possible in ring-shaped dies made up insections.

In the accompanying drawings, Figure 1 represents one side of thering-die with the lines of fracture in the same, and Fig. 2 is a sectionof such die at the line w 00 of Fig. 1.

I claim as my invention' The'method herein specified of manufacturingannular'dies, consisting in finishing up the ring of soft steel with thenecessary contour, engraving, or ornamentation upon the interior surfacethereof, hardening the Signed by me this 1st day of November, said ring,and afterward breaking the ring 1888. aozu't into two 01' more sectionsada )ted to 1 b eing placed together fOl11SGO1'1GlT1OV%3dfPOl11 IEC'AULERL 5 the article that is rolled or otherwise formed XVitnesses:

to shape Within such ring-shaped die, sub (1rEO.'l.PINCKNEY, smntiallyas Set forth. WILLIAM G. MoTT.

